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The Portuguese forward scored a hat-trick to reach seven league goals in his last four matches, turning his form around after a troubled start to the season.

Ronaldo netted four goals in his first 14 league matches, his poor form one of the reasons Barcelona were able to leave Madrid in the wake during the first half of the season.

'We are happy (with Ronaldo),' Zidane told reporters. 'On Friday they asked me if I was worried about him not scoring goals and he scored three.'

The Portuguese forward scored a perfect hat-trick after scoring with his head and both feet

Ronaldo rounded Sociedad keeper Geronimo Rulli to score his third and Madrid's fifth

Last season Ronaldo converted into a centre-forward in a classic No 9 mould from his previous role as a winger, helping the side retain the Champions League by scoring crucial hat-tricks against Bayern Munich and Atletico Madrid as well as a brace in the final against Juventus.

He was back to his clinical best against Real Sociedad after missing chances last weekend in a 2-2 draw against Levante, putting the final touch on an excellent team move in the first half and heading home from a corner.

Ronaldo's third goal exhibited his pure poacher's instinct, alert to fire home the rebound after Gareth Bale's shot was blocked by Geronimo Rulli.

Zidane say he's not worried about Ronaldo as they prepare for PSG on Wednesday evening